Tandem harrow



TANDEM HARROW Filed Ju pe 27, 1928 I 2 Sheets-Sheet 1 5 A- q w u H.E.'ALTG ELT TANDEM HARROW Oct. 7,1930.

Filed June 27, 1928 2 Sheets-Shee 2 Patented Oct. 7, 1930 om TED; STATES 1 V H RMAN E. ALTGELT, or sourrn BEND, INDIANA, A'ssreivoniarmnsnn assrenmnnrs,

to OLIVER FARM EQUIPMENT oomrnnr, .A con'ronn'rron OF'DELKWABE x TAnDEiIrnAnnow Application filed Tune 27,

This invention relates to that type of harrows in which gangs of harrow disks are arranged in tandem and "are so mounted that they may be set ,in angu-lar relation for working or set at a rightangle to the center vention resides in. certain novel features which will be hereinafter first fully scribed and then more particularly defined in the appended claims.

In the drawing, Figure 1 is a plan View of a harrow embodying the invention;

Figure 2 is a side elevation of the same;

Figure 3 is a detail rear elevation more particularly showing the connection between the rear gangs. v y

In carrying out the inventiomthere is pro vided a draw bar 1 to the front end of which is secured a clevis 2 to facilitate connection with a tractor or other hauling agency, and it may be noted that the clevis is constructed to permit vertical adjustment of the draft and may be secured to either the top or the bottom of the draw bar, thus providing for a wide range of draft conditions.

On the upper side of the draw bar is formed or rigidly secured a rack bar 3 having longitudinally spaced upstanding lugs or teeth 4, and slidably encircling the draw bar and said toothed element is a sleeve 5 having a notch or slot 6 in its top at its front end and provided with ears 7 at the sides of the notch. Pivoted to and between the earsis a lever 8 having a rearwardly extending pawl '9 at its lower end to engage the lugs or teeth 4, a retractile spring 10 attached to the lever and the sleeve 5 yieldably holding the pawl in engagement with a tooth. At or near the upper end of the lever is a hole 11 for the attachment of a rope whereby the lever may be manipulated from the seat of the tractor.

Outer draft braces 12 are pivoted to the draw bar 1 by a single bolt 13, at a point in 192s. seriaim. 288,703.

advance of the lever, and diverge rearwardly, these draft braces consisting ofsimilar upper and lower flat bars 1 as shown most clearly in Fig.2. The rear end portions of thesev draft braces are bent slightly inwardly, as at 14,, and their rear extremities are. pivo ted, at 15, to thefouter sides of the frames lfiwhich carry the front gang of disks 17, and'a cross bar 18 extends between the draft braces'infront of the frames andis connected with the braces bybolts l9j secured in the braces and. passing through slots 20in the cross bar, this connection accommodab ing the angular shifting of the braces and preventing excessive spreading of the same. Inner draft braces21are rigidlysecured at their rearfends, as at 22, to the inner'sides of theframes 16 and have their frontends piv otally engagedin lugs 23 onthe sides of the up and the lever will ride ror aa yover the ratchetfbar. In the describedangular shifting of the gangs, the primary movement isjpivotal about the bolt 13 ;as a center'and both gangs" have the same center of moves Y The cross bar 18 slides on'the main draw bar '1 and isheld against lateral movement by a clip pajssingbeneaththe "drawlbar and secured to {the cross bar by bolts2t, the gangs being thus maintained equidistant from the draw bar in fallpositions. It will be noted that. the construction very simplefthe' numberof partsbeing minimized without anyloss of strengthyand as the gangs are always equidistant from the main drawbar the;

1 draft is lessened and more evenly'distributed than in prior constructions; toe

The inner ends of the gangs are brought close together so that there will be no central untilled ridge left by the harrow as was the case with many prior constructions, and the rear portion of the drawbar is arched, as at 25, to avoid striking the disks, .a brace 26 being provided to reenforce the arched por'- tion of the drawbar. I

To the rearend ofthe drawbaris secured an extension 27 consisting of upper and lower similar bars, and to the rear end of the exten sion, between the members thereof, are, rigidly v secured the fan-shaped or substantially triangular plates 28. To the rear. ends of therfram'e i 16, adjacent the inner cornersthereof, are secured bra ckets29 to which are pivoted the front ends'o'f'links 30, therear endsof said links being pivoted to the outer frontcorners of the frames'gl carrying the rear gangs of'd isks 32. Thefront bar' 33 of each frame 31 is extended laterallyfrorn the inner corner of the frame and carrie'd rea-rwardly', as at 34, to be pivotallysecured by. the rear bolt 35 which secures'the'plates 28 to the drawbar extension 27. The "rear, gangs thus have a single center of pivotalmovement and are always equidistant'from the draw bar, the plates 28 s'ustaining the extensions3 i and relieving the 1 bending strain upon them and the pivot bolt Having fully described'my invention what I claim as: new and desire to secure by Letters Patent,is:' v

' 1. A harrow comprising a drawbar, verti cally spaced sustaining plates secured to the rear end of the drawbar, gang frames disposed at theopposite sides of the'drawbar and having their front bars extendinglaterally inward'between the sustaining plates, and a" single pivot connecting the extremities of the extensions fromboth gang frames to the draw" bar between thesustaining plates. 7

2. A harrow comprisinga drawbar, gang framesdisposed at opposite sides of the drawbar, draft braces pivoted to the outer sides of the I respective frames and converging forf- Wardly to thedrawbar, a single pivot connecting the front ends of both draft braces to the drawbar, shiftable connections between the drawbar and the inner sides of the gang frames, and a crossbar slidably and pivotally connected With the draft braces and slidably. engaged-with the drawbar. p

3.' A harrow comprising a drawbar, gang framesdisposed at opposite sides of the drawbar, draft braces pivotedto the outer sides of the gangframes and convergingforwardly; a single pivot connecting the front ends of the braces to the drawbar at a fixed point, inner draft braces having their rear ends fixed: to the inner sides of the respective gang frames, and a. shiftingedevice connected to the front ends of the inner draft braces and slidably mounted onthe drawbar.

a rear seeseaf h e-W ne. len tad s: posed at-thessides of thedrawbar, the rear gangs having a common pivotal connection withrtheuend of the drawbar, the front gangs being pivoted about their outer ends, and swinging link-eonneetions between the outer front corners of the rear gangs andthe inner rear corners of thefront gangs.

' In "testimony whereofll'have signed this specification.

- v HERMAN ALTGELTQ 4. A harrow comprising a drawbar, gangs He's 

